litoral vs sea-coast

litoral and sea-coast both are nouns.

Word	Noun	Adjective	Verb	Adverb
litoral	Yes	No	No	No
sea-coast	Yes	No	No	No

As nouns, sea-coast is a hypernym of litoral; that is, sea-coast is a word with a broader meaning than litoral:

Other hypernyms of litoral include coast, seacoast, seashore.

litoral (noun)	sea-coast (noun)
the region of the shore of a lake or sea or ocean	the shore of a sea or ocean